Earlier today (okay, technically yesterday) I came across the
concept of bogons, or IP address not officially allocated for
use. They even provide a
current list of non-routed IP
blocks. Curious about the effect of using said list to block potential
spam, I setup a test, consisting of 565,012 tuples (we've stepped up testing
of the greylist daemon over the
past week) previously processed (I'm keeping some extensive logs here),
added the 6,803 IP blocks not
allocated, and let it rip.
An hour and a half later, I had my answer.
Of 565,012 tuples processed, only 6,117 came from non-allocated IP space.
It's a little over 1%.
I don't think it's worth adding the non-allocated IP space to the greylist daemon. Not that it makes the
daemon run slower, it's just that an IP list of that size takes up quite a bit of memory due
to the trie
structure used to store the table, and for such a small gain, I don't
feel it's really worth it.
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